Netlib

Apart from a smattering of XP_OS2 defines in file and socket managing code (which may well disappear if nsFileSpec sorts itself out), there are a couple of places where some platform-specific code is required.

Netlib thread

nsNetThread.cpp contains code to run netlib threads (OS/2 code yet to be checked in to mozilla.org CVS).

The code is outdated and won't work. It needs to be rewritten. Actually, even when it wasn't outdated, NETLIB_THREAD builds didn't work.

Asynchronous DNS

At the moment, mozilla will hang while doing DNS queries. This is bad. Some threaded code needs to be written to make this better.

Someone claimed to be working on this, but they seem to have gone away.